Electric switch.



PATENTBD JULY 31, 1906 G. 'W. RICHARDSON. 1 7

ELEGTRIU SWITCH. APPLICATION PILED MAY 16, 1905.

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(iizorney.

j To all? whom, it may concern:

. ED STAEL PATENT OFFICE; l

. chosen w. RICHARDSON, or wrssaniokon; PENNSYLVANIA.

I ELEQTBIO SWITCH. I i i Be it known that-I, GEORGE W. RiemansoN, residin at Wissahickon, in the county of Philadelp a and State of Pennsylvania, have invented certain Improvements in Electric Switches, of Which-the following is a specification;

.Thisinvention is an electric switch which throws positively to break or make a circuit when struck by a movin part. It is designed to provide a simple and eiiicient mechanism operating automatically, as b the lifting block, to preventt 1e overhoisting of lec'triccranes or hoists and the breaking of the mechanism. The switch is adapted to be held upon a stationarypart of the mechanismindependent of the fting' mechanism, to be operated thereby as a safety device in the emer ency of their reaching the permissible limit of their movement, upon which the switch is thrown and thecircuit broken. In the accompanying-drawings Figure 1 is a plan. View representing the switch as it is mounted. Fig. 2 is a transverse sectional view thereof; and Fig. 3 1s a sectional view taken on the line 3 Sci Fig. 1.

' As shown in the drawings, the mechanism comprises the base 1 to which is fixed the nesulatinglate 2 and the stud .3. i The plate has fixe thereto thete'rminal pieces 5 and '5, provided, res'pectivel with the bindingscrews 6 and 6 and wit the contact-jaws 7 and 7". A stud-bolt or spindle 8 fixed to the plate 2, acts as a fulcrlim for the arm9,.

being the switch-blade, and the arm 10 for operating it, these parts being connected to-' gether to form a flexible lever by a spring 11,-

' coiled tapon the spindle and havlng its res ective en 1.2 is pivotally connected by a bolt 13 to they arm 10 ;and by a bolt 14 to an arm or link 15,

having-the pivotal cgnmection 1.6 with the:

stud 3', the link 12 having the parts 12 eledtricali separated and .mechanically eonnected by .the insulating-piece .12. With this mechanism in the osition shown in Fi 1 a part moving as t e arrow shown W11 strike the elbow of the broken toggle formed by the, links 12 and 15 and throw the mov-- 5o able parts-to the positions shown by the dot- 4 Specification of Letters Patent. Applicatioiifiled m 1a, 1905. Serial No. 260.616.

the impact of fixed to the parts 9 and 10. A ink .latingesupport, a pair of termina Patented July 31, 1908.

ted lines, the switch-blade Q' being Eiithdrawn: from the Jaws 7 to break the circuit gaged with the jaws 7. 1

therethrough an en As the action of the hn 12 upon the arm 10 is carried through the spring 11 to the arm 9,

the latter is not thrown until the s ring has been brought under tension, and t ereupon the blade is sna pedor thrown quickly by the spring to ma either manually or automatically, the switch- -blade is thrown in the opposite direction.

invention, l claim 'v -1. An electric switc lating-support, a. contact. mem er fixed thereto, a contact member 'fulorumed on e and break contact with out sparking. By breaking down the toggle,

said support to engage and disengage said I fixed contact member, and a toggle mechanism having a spring connection with said fulcrumed member for sna ing it into andout of engagementwith' said 'ed contact member, substantially as specified.

2. An electric switch comprising an'insulilting-support, a terminal fixed thereto, jaws fixed to said'terminal, a switch-blade fulcrumed on said support for making and breakin a circuit throu h said terminal, an arm fu crumed on. sai sup ort, a coiled spring connected to, said bla e and arm for transmitting the movement of the latter to the former, and a toggle for operating said arm, substantially as specified.

3. An electric switch comprising a terminal aving a contact member, a flexible lever having a COIItflOtrfiJ'ID forengaging said contact member, and a toggle for operating said lever, substantially as specified.

4. An electric switch comprising s havin aws fixedto said support, a spindle carrie an insue ysaid su port aswltch-blade fulcrumed by said spind e an ada ted for engaging the respective jaws of sai terminalsan arm ful-.

crumed b .said spindle, a sprm coiled on said spind e and connected to sai blade'and.

arm, and mechanism for operating said arm, substantially as specified.

- 5. The combinationof a'bas'e, an insulat ing-plate secured to said base, terminals secured to said plate, a fulcrum, an arm adapted to oscillate on said fulcfum to make and In testimony whereof I have hereunto set break contact with said terminals, a second my hand, this 13th day of May, 1905, in the arm oscillating on said fulcrum, a spring conp /esence of the subscribing Witnesses.

'necting said arms, an arm fulcrumed on said GEORGE W. RICHARDSON. 5 base, and a link connecting the second with Witnesses:

the'last-named arm, substantially as speci- HOMER S. GATEs,

fled. i UTLEY E. CRANE, J1. 

